Auditory processing disorder (also known as central auditory processing disorder or CAPD) is a condition that makes it hard for kids to recognize subtle differences between sounds in words. It affects their ability to process what other people are saying.
Gallium is a solid metal at room temperature, but it melts in your hands. 00:09. When gallium is in its liquid state, if feels like cold melted solder in your hands. 00:33. Melting gallium onto aluminum makes the aluminum brittle enough to break with your fingers.
Different metals melt at different temperatures, so knowing which metals you have can help you adjust the heat accordingly. Put all of the scraps of one type into the crucible, and apply a layer of baking soda over the metal. Raise the flame on the torch according to the type of metal you need to melt.